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| Brachiostomata Cladogram | |
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| Topic Started: Jul 20 2008, 09:41 PM (1,035 Views) | |
| Saxophlutist | Jul 20 2008, 09:41 PM Post #1 |
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Adult
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![]() Here is a cladogram for the phylum Brachiostomata I was able to put together. I might revise it later and put in more archaiac groups. These are a phylum of creatures with two-axis symmetry or quadrilateral frontal symmetry. They evolved from detritus feeding worm-like organisms. The majority of the major groups are sessile creatures. The most primitive groups the Bullazoa and the Archaeobrachidia show already many trait that will be used as a template for future groups. The two extant major groups are the Ovamorphs and the Sagittamorphs. Ovamorphs are sessile and mostly sessile organisms. The Sagittamorphs are a subphylum of organisms that are resultant from neoteny, with their body plan coming from the larvae of sessile ancestors. (Illustrated at the left)
Edited by Saxophlutist, Sep 21 2008, 02:09 PM.
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| Marty Party | Oct 3 2008, 04:31 PM Post #2 |
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Fithp Herdmaster
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so these are kinda like crinoids or sea anemones with shells? |
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| Saxophlutist | Oct 3 2008, 06:07 PM Post #3 |
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Somewhat, I'd a-liken the filterfeeders more to seas cucumbers. And they are mostly soft-bodied with cartilidge-like supports. The ones with shells and mineralized internal skeletons swim around, and fill the active niches. |
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9:42 AM Jul 11